package creator

import (
	"testing"
	"time"
)

func TestFixedScheduleUsesDueBoundary(t *testing.T) {
	now := time.Date(2026, 4, 1, 12, 0, 0, 0, time.UTC)
	last := now.Add(-time.Hour)
	if !IsDue(last, now, time.Hour) || IsDue(last.Add(time.Minute), now, time.Hour) {
		t.Fatal("schedule due check must include the exact boundary")
	}
	if got := NextFixedRun(last, now, time.Hour); !got.Equal(now.Add(time.Hour)) {
		t.Fatalf("next fixed run = %s", got)
	}
	if got := NextFixedRun(time.Time{}, now, time.Hour); !got.Equal(now) {
		t.Fatalf("first fixed run = %s", got)
	}
}

func TestMetricDuePreservesUnavailableState(t *testing.T) {
	now := time.Now().UTC()
	if MetricDue(Work{}, now) {
		t.Fatal("missing metric schedule is not due")
	}
	past := now.Add(-time.Minute)
	if !MetricDue(Work{NextMetricAt: &past}, now) {
		t.Fatal("past metric schedule is due")
	}
}

func TestNextMetricAtSkipsLateHistoricalPoints(t *testing.T) {
	published := time.Date(2026, 4, 1, 0, 0, 0, 0, time.UTC)
	now := published.Add(8 * time.Hour)
	got, reason := NextMetricAt(published, now, time.Hour, 24*time.Hour, 2, 48*time.Hour)
	want := published.Add(15 * time.Hour)
	if reason != "" || !got.Equal(want) {
		t.Fatalf("late metric schedule = %s, reason %q; want %s", got, reason, want)
	}
}

func TestNextMetricAtStopsAtMonitoringAge(t *testing.T) {
	published := time.Date(2026, 4, 1, 0, 0, 0, 0, time.UTC)
	if got, reason := NextMetricAt(published, published.Add(47*time.Hour), time.Hour, 24*time.Hour, 2, 48*time.Hour); !got.IsZero() || reason != "monitoring_age_reached" {
		t.Fatalf("expired metric schedule = %s, reason %q", got, reason)
	}
}